CN202677906U - Low-smoke, halogen-free and flame-retardant type fire-resistant cable for novel nuclear power station - Google Patents

Low-smoke, halogen-free and flame-retardant type fire-resistant cable for novel nuclear power station Download PDF

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Publication number
CN202677906U
CN202677906U CN 201220303381 CN201220303381U CN202677906U CN 202677906 U CN202677906 U CN 202677906U CN 201220303381 CN201220303381 CN 201220303381 CN 201220303381 U CN201220303381 U CN 201220303381U CN 202677906 U CN202677906 U CN 202677906U
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CN
China
Prior art keywords
periphery
low
free
smoke
cable
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220303381
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Chinese (zh)
Inventor
徐佳
洪启付
张雷
段惟碌
朱宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHANGZHOU BAYI CABLE Co Ltd
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CHANGZHOU BAYI CABLE Co Ltd
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Priority to CN 201220303381 priority Critical patent/CN202677906U/en
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Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a low-smoke, halogen-free and flame-retardant type fire-resistant cable for a novel nuclear power station, wherein a calcined muscovite tape is wrapped at the periphery of the tin-plated copper conductor. An insulating layer is extruded at the periphery of the calcined muscovite tape from inside to outside. A layer of warping tape is wrapped at the periphery of the cable core of the insulating layer core. A low-smoke, halogen-free and highly flame-retardant type blanket is extruded at the periphery of the warping tape. The oxygen index of the low-smoke, halogen-free and highly flame-retardant type blanket is greater than 35. A total shielding layer is weaved at the periphery of the low-smoke, halogen-free and highly flame-retardant type blanket. An outer sheath is extruded at the periphery of the total shielding layer. According to the fire resistance rating of the cable, the highest temperature resistance of the cable can reach 950 DEG C. Thus, the fire-resistant layer of the cable can not fall off at a high temperature.

Description

A kind of nucleus power station low-smoke halogen-free flame retardant fire-resisting cable
Technical field
The utility model relates to a kind of cable, is specifically related to a kind of nucleus power station low-smoke halogen-free flame retardant fire-resisting cable.
Background technology
At present, in the fire-resisting cable design and manufacturing of China, synthetic mica is widely used, and this mica tape is except the characteristic with natural mica band, and its main feature is that thermal endurance class is high.In conventional occasion, the fire-resisting cable that is manufactured by this synthetic mica tape just can meet the demands.Used in nuclear power station low-smoke halogen-free flame retardant fire-resisting cable is different from the fire-resisting cable of 830 ℃ of general fire resistance ratings, product requirement not only will meet IEC60754, IEC61034, IEC60332-1, IEC60332-3-23 low-smoke non-halogen flame-retardant performance, but also requirement can be by 950-1000 ℃ of temperature grades, and continuing to supply the fire time is the category-A fire resistance test of 90min.Although the fire resistance rating of synthetic mica tape can reach 950 ℃,, the manufacturing process of this mica tape is that synthetic mica is copied the mica paper of making is main material, with adhesive glass cloth is sticked on one or both sides again and makes.In manufacture process, several layer of structure must be bonded together, when carrying out cables manufacturing or laying, just might cause the layering of mica tape and come off.
In addition, along with the existence of the force majeure factors such as various earthquakes, if mechanical oscillation occur in combustion process cable, cable will lose fire-resistance property, and mechanical oscillation are that occurrence probability is high in the fire incident.Still have poisonous gas to discharge during simultaneously conventional mica tape fire-resisting cable burning, for the nuclear power station occasion, product is to the nontoxic special requirement that proposed of low smoke and zero halogen.
Therefore, under the above-mentioned background condition, need the fire-resistant shock resistance type cable of a kind of novel used in nuclear power station low-smoke halogen-free flame retardant, to satisfy the requirement of nuclear power development tendency, cable can continue reliably working when guaranteeing the fire generation.
Summary of the invention
For the problems referred to above, the purpose of this utility model provides a kind of nucleus power station low-smoke halogen-free flame retardant fire-resisting cable, and the fire resistance rating of cable of the present utility model can reach 950 ℃, and at high temperature its flame retardant coating can not come off.
The technical scheme that realizes above-mentioned purpose is as follows:
Nucleus power station low-smoke halogen-free flame retardant fire-resisting cable, periphery at tinned copper conductor is surrounded with calcination white clouds master tape, the periphery of described calcination white clouds master tape is the extruded insulation layer from inside to outside, the wrapped one deck twining package tape of the periphery of described insulating barrier, the periphery of described twining package tape is extruded with the low-smoke bittern-free highly fire-proof oxygen barrier layer, the oxygen index of low-smoke bittern-free highly fire-proof oxygen barrier layer is greater than 35, the total screen of periphery braiding one deck of described low-smoke bittern-free highly fire-proof oxygen barrier layer, the periphery of described total screen is extruded with oversheath.
Adopted such scheme, adopted calcination white clouds master tape in the cable of the present utility model, the mica in the calcination white clouds master tape is crossed high-temperature process, has removed the crystallization water and the impurity that diminish proof voltage and resistance to elevated temperatures, has increased the stability of calcination white clouds master tapes.And the content of organic siliconresin exceeds more than 50% than conventional fire-resistant isinglass belt in this calcination white clouds master tape, and calcination white clouds master tape low-molecular material in combustion process vapors away, and high-temperature resistant silicone glue at high temperature sinters into SiO with mica 2Be the fine and close conductor protecting sheathing of agent structure, effectively improved the fire resistance of cable, heatproof can reach more than 950 degree.Have good withstand voltage properties, high-flexural strength acid and alkali-resistance, radioresistance, nontoxic, good flexibility.Calcination white clouds master tape is wrapped compacter, docile between layers on conductor the time, adds that wrapped speed is well-balanced, and angle control suitably can effectively be avoided coming off of mica layer, guarantees the globality of flame retardant coating.Cable of the present utility model has adopted calcination white clouds master tape, special structural design and advanced manufacturing process.Product meets the nontoxic fire-retardant requirement of low smoke and zero halogen (satisfying IEC60754, IEC61034, IEC60332-1, IEC60332-3-22) of cable for nuclear power station.
Be provided with the glass layer between described calcination white clouds master tape and the insulating barrier, this glass layer is fixed on the periphery of calcination white clouds master tape in the mode of braiding.The glass layer reaches more than 90% the percentage of braiding coverage of calcination white clouds master tape, this material can become finer and close through behind the high temperature sintering, envelope flame retardant coating fully, even mechanical oscillation occur in combustion process cable, also can avoid calcination white clouds master tape to come off.The utility model can by fire-resistant shock-resistant (the GB/T19216.31 flame temperature be not less than 830 ℃, continue to be no less than for the fire time in time of 120 minutes, apply mechanical shock and apply 1kV voltage, the 2A fuse does not fuse) test requirements document.Therefore, after calcination white clouds master tape periphery has woven the glass layer, can guarantee in the situation that high temperature and mechanical oscillation, cable can keep normal operation.The glass layer satisfies following requirement (seeing the following form) to the performance of cable:
Sequence number Project Requirement
1 Proportion g/m 2 180
2 Fracture strength N/20mm >500
3 Glass cloth fusing point ℃ ≥500
4 Alkali metal oxide content % <0.8
5 Textile size content % 0.6~2.0
Described calcination white clouds master tape is supporting material by calcining muscovite paper, individual layer alkali-free glass fiber cloth, closes with high temperature resistant organic silicone adhesive to form.Compare with synthetic mica tape paper, what the calcination mica paper adopted is the high mica raw material of high temperature resistant grade, the crystallization water and impurity have been removed through high temperature again, thereby the temperature resistant grade of calcining mica paper is when reaching synthetic mica paper standard, flexibility and stability are better than synthetic mica paper, compare with gold mica tape paper, and not only high temperature resistant higher grade for the calcining mica paper, and the dielectric strength fluctuation range is less, and withstand voltage properties is better.
The consumption of described calcination white clouds master tape is 170-190g/m 2, wherein the content of calcination mica is 120-130g/m 2, individual layer alkali-free glass fiber cloth content is 30-34g/m 2, high-temperature resistant silicone glue content is 20-26g/m 2The main body that plays the hot-face insulation effect in the various mica tapes is mica, the more high more favourable sharp fire resistance that improves fire-resisting cable of mica content.Adopt the mica tape of single face glass-fiber-fabric reinforcement to have the advantage that mica content is high, cost is low on year-on-year basis, performance is more stable, and the relatively two-sided or three-in-one reinforcement mica tape of single face mica tape, joint is more easily processed, the thickness of lap-joint only slightly increases, outward appearance is more level and smooth, docile during injection moulding, thereby is conducive to improve the operating efficiency of rear road Shooting Technique.
Described oversheath is the oversheath of heat cured low smoke halogen-free flame-retardant polyolefin.This oversheath possesses good fire resistance and good mechanical performance, and good mechanical performance has also guaranteed to meet the requirement of cable for nuclear power station the designed life in 60 years of cable.Performance satisfies following requirement:
Sequence number Project Unit Require *
1 Mechanical performance
1.1 Mechanical performance before aging
Tensile strength 〉= N/mm 2 9.0
Elongation at break 〉= % 150
1.2 Mechanical performance after air-oven is aging
Aging temperature 120±2
Ageing time h 240
The tensile strength rate of change≤ ±25
The elongation at break rate of change≤ ±25
2 Combustibility
2.1 The pH value 〉= 4.3
2.2 Conductivity≤ μS/mm 10
2.3 Halogen content≤ mg/g 5
2.4 Poison exponent≤ 2.5
2.5 The test of cable smoke density 〉= % 70
The performance characteristic of cable of the present utility model is as follows:
1, during 90 ℃ of or maximum operating temperatures specified at cable, the normal service life of cable is more than 60 years.
2, cable is by the fire-resistant impulse withstand test of IEC60331-2, GB/T19216.31/IEC60331-1.
3, cable is by 3500V/5min, withstand voltage test after the 6D bending.
4, the cable halogen acid gas is measured: pH value 〉=4.3, conductivity≤10 μ s/mm, smoke density light transmittance 〉=70%.
5, the finished cable burning test is by IEC60332-3-22 and the single testing vertical flammability of IEC60332-1.
6, the anti-irradiation dose of cable is not less than 25Mrad.
Description of drawings
Fig. 1 is the structural representation of cable of the present utility model;
Fig. 2 is the structural representation of cable core in the cable;
In the accompanying drawing, 1 is cable core, and 11 is tinned copper conductor, and 12 are calcination white clouds master tape, and 13 is insulating barrier, and 14 is the glass layer, and 2 is twining package tape, and 3 is oxygen barrier layer, and 4 is total screen, and 5 is oversheath.
Embodiment
See figures.1.and.2 nucleus of the present utility model power station low-smoke halogen-free flame retardant fire-resisting cable.Periphery at tinned copper conductor 11 is surrounded with calcination white clouds master tape 12, the periphery of described calcination white clouds master tape 12 is extruded insulation layer 13 from inside to outside, be provided with glass layer 14 between calcination white clouds master tape 12 and the insulating barrier, this glass layer is fixed on the periphery of calcination white clouds master tape in the mode of braiding.Consisted of the cable core 1 of cable in the utility model by tinned copper conductor 11, calcination white clouds master tape 12, glass layer 14 and insulating barrier 13.Described calcination white clouds master tape is supporting material by calcining muscovite paper, individual layer alkali-free glass fiber cloth, closes with high temperature resistant organic silicone adhesive to form.The consumption of described calcination white clouds master tape is 170-190g/m 2, wherein the content of calcination mica is 120-130g/m 2, individual layer alkali-free glass fiber cloth content is 30-34g/m 2, high-temperature resistant silicone glue content is 20-26g/m 2The wrapped one deck twining package tape 2 of the periphery of described insulating barrier.The periphery of described twining package tape is extruded with low-smoke bittern-free highly fire-proof oxygen barrier layer 3, the combustion characteristics of cable depends primarily on the performance of oxygen barrier layer 3, not only needing has very high oxygen index, also must possess good crust performance, by compare of analysis repeatedly, the oxygen index of the low-smoke bittern-free highly fire-proof oxygen barrier layer in the utility model is greater than 35.The total screen 4 of periphery braiding one deck of described low-smoke bittern-free highly fire-proof oxygen barrier layer, the periphery of described total screen is extruded with oversheath 5.Oversheath is the oversheath of heat cured low smoke halogen-free flame-retardant polyolefin.After the utility model has adopted calcination white clouds master tape, be compared as follows with some performances of other mica tapes:
The nucleus of the present utility model power station manufacture method of low-smoke halogen-free flame retardant fire-resisting cable, conductor adopts many circular tinned copper conductors, meets GB/T 3,956 2 class stranded conductor requirements, and is concentric stranding, guaranteed that cable possesses certain flexibility, is convenient to lay.Will prevent conductor jumping creek on the technique, conductor requires rounding, guarantees carrying out smoothly of rear road calcination white clouds master tape around-packing technology.After choosing conductor, at first at the wrapped calcination white clouds of the periphery of tinned copper conductor 11 master tape, mica tape intersects simultaneously wrapped with S and Z-type.Calcination white clouds master tape 12 is supporting material by calcining muscovite paper, individual layer alkali-free glass fiber cloth, closes with high temperature resistant organic silicone adhesive to form.The consumption of described calcination white clouds master tape is 170-190g/m 2, wherein the content of calcination mica is 120-130g/m 2, individual layer alkali-free glass fiber cloth content is 30-34g/m 2, high-temperature resistant silicone glue content is 20-26g/m 2Then behind the periphery extruded insulation layer 13 of calcination white clouds master tape, carry out cross-linking radiation.Behind the wrapped calcination white clouds of the periphery of tinned copper conductor master tape, periphery braiding layer of glass fiber layer 14 at calcination white clouds master tape, the glass layer reaches more than 90% the percentage of braiding coverage of calcination white clouds master tape, this material can become finer and close through behind the high temperature sintering, envelope flame retardant coating fully, even mechanical oscillation occur in combustion process cable, also can avoid calcination white clouds master tape to come off.The utility model can by fire-resistant shock-resistant (the GB/T19216.31 flame temperature be not less than 830 ℃, continue to be no less than for the fire time in time of 120 minutes, apply mechanical shock and apply 1kV voltage, the 2A fuse does not fuse) test requirements document.Therefore, after calcination white clouds master tape periphery has woven the glass layer, can guarantee in the situation that high temperature and mechanical oscillation, cable can keep normal operation.Again at the periphery extruded insulation layer 13 of glass layer.Insulating barrier 13 adopts the low-smoke halogen-free flame retardant cross-linked polyolefin, and it is crosslinked to adopt radiation mode to carry out, and has guaranteed on the one hand the fire resistance of cable, has strengthened again on the other hand the radiation-resistant property of cable, meets the running environment requirement of cable in nuclear power station.Simultaneously, the mechanical performance of high-quality has also been guaranteed cable in the Heat Ageing that stands 90 ℃ of conductor temperatures, the designed life in 60 years.Adopt suitable mould and crowded tube process when insulating exruded, can effectively guarantee the continuity of cloud surface layer, for doing guarantee by fire-resistant impulse withstand test.Then at the wrapped one deck twining package tape of the periphery of insulating barrier; Then the periphery at twining package tape extrudes one deck low-smoke bittern-free highly fire-proof oxygen barrier layer, and the oxygen index of this low-smoke bittern-free highly fire-proof oxygen barrier layer is greater than 35; The low-smoke bittern-free highly fire-proof oxygen barrier layer adopts plsitive mold to extrude in extrusion, and purpose is wrapped on the cable core low-smoke bittern-free highly fire-proof oxygen barrier layer closely, has improved fire-retardant, fire-resistant impact resistance.By the assurance of above-mentioned material selection and technique, cable is when testing, and the crust performance is very superior, effectively guarantees the skeleton structure of whole cable.Then the periphery in the low-smoke bittern-free highly fire-proof oxygen barrier layer weaves the total screen of one deck; After extruding one deck oversheath, the periphery of total screen again carries out cross-linking radiation.The oversheath of cable not only will possess good fire resistance also must have good mechanical performance, so oversheath is the oversheath of heat cured low smoke halogen-free flame-retardant polyolefin, and oversheath carries out cross-linking radiation after extruding, to guarantee the radiation-resistant property of cable.Simultaneously, good mechanical performance has also guaranteed the designed life in 60 years of cable.

Claims (3)

1. nucleus power station low-smoke halogen-free flame retardant fire-resisting cable, it is characterized in that, periphery at tinned copper conductor is surrounded with calcination white clouds master tape, the periphery of described calcination white clouds master tape is the extruded insulation layer from inside to outside, the wrapped one deck twining package tape of the periphery of described insulating barrier, the periphery of described twining package tape is extruded with the low-smoke bittern-free highly fire-proof oxygen barrier layer, the oxygen index of low-smoke bittern-free highly fire-proof oxygen barrier layer is greater than 35, the total screen of periphery braiding one deck of described low-smoke bittern-free highly fire-proof oxygen barrier layer, the periphery of described total screen is extruded with oversheath.
2. nucleus according to claim 1 power station low-smoke halogen-free flame retardant fire-resisting cable is characterized in that, described calcination white clouds master tape is supporting material by calcining muscovite paper, individual layer alkali-free glass fiber cloth, closes with high temperature resistant organic silicone adhesive to form.
3. nucleus according to claim 1 power station low-smoke halogen-free flame retardant fire-resisting cable is characterized in that, described oversheath is the oversheath of heat cured low smoke halogen-free flame-retardant polyolefin.
CN 201220303381 2012-06-26 2012-06-26 Low-smoke, halogen-free and flame-retardant type fire-resistant cable for novel nuclear power station Expired - Fee Related CN202677906U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103578660A (en) * 2013-11-05 2014-02-12 四川明星电缆股份有限公司 Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel
CN104282368A (en) * 2013-07-05 2015-01-14 上海市高桥电缆厂有限公司 Multifunctional isolation-type inflaming-retarding and fire-proof cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104282368A (en) * 2013-07-05 2015-01-14 上海市高桥电缆厂有限公司 Multifunctional isolation-type inflaming-retarding and fire-proof cable
CN103578660A (en) * 2013-11-05 2014-02-12 四川明星电缆股份有限公司 Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel
CN103578660B (en) * 2013-11-05 2016-10-05 四川明星电缆股份有限公司 The manufacture method of the generation Ⅲ nuclear power station interior lv power cable of containment

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130116

Termination date: 20180626